1.
2.
AIR QUALITY
2.1.1
In
accordance with the EM&A Manual, 1-hour Total Suspended Particulates (TSP)
levels should be measured at the designated air quality monitoring stations to indicate
the impacts of construction dust on air quality. Impact 1-hour TSP monitoring
was conducted for at least three times every 6 days.
2.2
Monitoring Equipment
2.2.1
A
portable direct reading dust meter was used to carry out the 1-hour TSP
monitoring at the designated monitoring stations.
2.2.2
Wind
data monitoring equipment is provided at the conspicuous locations for logging
wind speed and wind direction near to the dust monitoring locations. The
equipment installation location is agreed with the ER and the IEC.
2.2.3
The
model of the air quality monitoring equipment used is summarized in Table
2.1.
2.3.1
Portable
Laser Particle Photometer Monitors (Sibata Model
LD-3B / 5R) complete with appropriate sampling inlets are employed for 1-hour
TSP measurement.
Measuring Procedures
a) Pulling up the air sampling inlet
cover
b) Changing the Mode 0 to BG
c) Pressing Start/Stop switch
d) Turning the knob to SENSI.ADJ and
press it
e) Pressing Start/Stop switch again
f) Returning the knob to the position
MEASURE slowly
g) Pressing the timer set switch to
set measuring time
h) Removing the cap and start the
measurement
Equipment Calibration
1-hour
dust meter should be calibrated at 1 year intervals. The calibration
certificates are presented in Appendix D.
2.4.1
ET
shall submit sufficient information to the IEC to prove that the instrument is
capable of achieving comparable results to the HVS. The instrument should also
be calibrated regularly, and the 1-hour sampling shall be determined
periodically by the HVS to check the validity and accuracy of the results
measured by direct reading method. The calibration certificate for the direct
reading dust meter is provided in Appendix
D.
2.5.1
In
accordance with the EM&A Manual, two air quality monitoring locations,
namely AM1, AM2 are covered under Contract No. SPW 07/2020 “Environmental Team
for Construction of Yuen Long Effluent Polishing Plant Stage 1”.
2.5.2
The
most updated locations are summarized in Table 2.2 and the locations of the air monitoring stations shown in Figure
2.
2.6.1
The
schedule of air quality monitoring in reporting month is provided in Appendix
E.
2.6.2
No
Action / Limit Level exceedance was recorded for 1-hr TSP at AM1 and AM2.
2.6.3
No
effect that arose from the other factors was noted during the current
monitoring month.
2.6.4
The
weather conditions during the monitoring are provided in Appendix
K.
2.6.5
The
monitoring data of 1-hr TSP are summarized in Table
2.3. Detailed monitoring data are presented in Appendix
F.
2.6.6
The
Action and Limit Levels for air quality monitoring have been set and are
presented in Appendix C.
2.6.7
The
Event and Action Plan for air quality is given in Appendix
H.
2.6.8
The
wind data obtained from the on-site wind station during the reporting period is
provided in Appendix G.
2.7.1
The
monitoring data of 1-hr TSP was compared with the EIA predictions as summarized
in Table
2.4.
2.7.2
The
1-hr TSP monitoring results at AM1 and AM2 were below the Predicted Maximum
Hourly Average TSP Concentration in the approved Environmental Impact
Assessment (EIA) Report.